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vibrantglow posted:My Harmon/Kardon HK670 (made in either '79 or '80) has started to make very loud crackling sounds through the speakers when I turn it on. It also does this when I turn it off, and continues to do so for up to a minute. I had a HK380i (from 1980 or 1981) that did a similar thing, repairs were estimated at over 200$ by a tech. They pop up used for 50 to 75$ on CL et al, and I bought a used Sansui 551 to replace it. I opened it months later and all the caps in the preamp section were leaking (brown goo on and under the board), with two banks of diodes/transistors melted to their heatsinks.    Amazingly it sprung back to life with copious amounts of Deoxit, but I stored it immediately as I felt it was more of a fire hazard than anything else. Still, it played fine when I turned the power on, and then engaged the A/B speaker switch after 1-2 minutes. For your model, the service manual can be found at http://manuals.harman.com/HK/service%20Manual/HK670%20sm.pdf and lists all the capacitor values, which is useful since finding them in situ can be a pain with 30+ years of dust on them.
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Sep 20, 2009 18:01
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| # ¿ Apr 29, 2024 12:41 |
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